Whilst browsing tracks it takes forever to load the tracklist, the app may freeze or I cannot go back.
This may happen if you have hundreds of MP3s in a single folder.  mixHDJ can create lists of your mp3s (a file buffer) to speed things up, the process of creating the buffers will still takes a long time, so please be patient.
Enable the buffer from the MENU / FOLDER LISTS / USE BUFFER
mixHDJ mp3 buffer
Rescan folder will remove the file buffer for the current folder only, it will then be recreated next time you browse that particular folder. You can also help to speed up file browsing by keeping fewer mp3s in each folder.